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APPLICATION FILED NOV-22, 1920.

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E WA 1P0 M/LTD N MLDEY O/P/VEK E. M. WILDEY. MACHINE FOR USE INRELIEVING, CUTTING, SHAPING, PROFILING, AND THE LIKE PROCESSES.

APPLICATION FILED NOV.22, 1920. 1,434,078, Patented Oct. 31, 1922.

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A TTOFW 5% v E. M. WILDEY. MACHINE FOR USE IN RELIEVING, CUTTING,SHAPING, PROFILING, AND THE LIKE PROCESSES.

APPLICATION FILED NOV-22. I920.

Patented Oct. 31, 1922.

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EDWA IPD MILTON DEV H5712 asses JJ-WE.

A 7-7-0 P/v E V,

Patented Oct. 31, 1922.

UNITED STATES PATENTOFFICE.

EDWARD MILTON WILDEY, OF LONDON, ENGLAND.

MACHINE FOR USE IN RELIEVING, CUTTING, SHAPING, PROFILING, AND THE LIKEPROCESSES.

Application filed November 22, 1920. Serial No. 425,762.

To all whom it may concern:

Be it known that I, EDWARD MrL'roN VVILDn-Y, a subject of the King ofGreat Britain, residing at London, England, have invented certain newand useful Improvements in and Relating to Machines for Use in.Relieving, Cutting, Shaping, Profiling, and the like Processes, of whichthe follow ing is a specification.

This invention relates to improvements in and relating to machines foruse in cutting, sl1aping,' profiling and the like processes, having apivotally mounted tool-holder and means such as a cam element forimparting an oscillating movement thereto.

The invention is particularly adapted for use in machines for reliefcutting and shaping or formingwork, such as gear cutters, reamers, hobs,but is also adapted to operate with other machines of the generalcharacter above referred to.

The invention is particularly adapted for use in machines for reliefeuttii'ig and shaping or forming work, such as gear cutters,

-' reamers, hobs, but is also adapted to operate with other machines ofthe general character above referred to.

An object of the present invention is to provide an improved apparatuswhich may be used as an attachment to a lathe or as an independentmachine, whereby machine processes of the kind hereinabove referred tocan be eiiiciently and economically carried out.

Under the present invention the magnitude of the angular oscillations ofthe toolholder is varied independently of the shape of the cam elementfor imparting an oscillating movement to the tool-holder. Thus inappz'iratus of the kind. set forth having a pivotally mountedtool-holder and means such as a cam element for imparting an oscillatingmovement thereto, there is provided co-operating connecting mechanismbetween the tool-holder and the cam ele' ment with adjustment forvarying the magnitude of the angular oscillations of the tool-holder, sothat, for example, the amount of relief can be varied at will quiteindependently of the cam element.

Further with connecting mechanism according to the present invention forimpart mg movement to the tool-holder, and connected thereto so that apull over of the holder is imparted in lieu of the customary push over,rigidity of the tool-holder is ensured and chattering eliminated.

Advantages under the present invention comprise a remarkable speed ofproduction as a manufacturing machine tool. general. utility in theworkshop; its adaptability for a number of operations that wouldotherwise require special machines; and in the form of the inventionhereinafter described and illustrated in the drawings a comparativelyinexpensive attachment which enables relieving work to be carried out onan ordinary lathe. I

The accompanying drawings illustrate an embodiment of the presentinvent-ion in the form of a relieving attachment for a lathe.

In the drawings, Fig. 1 is an end view in the direction of the arrow A,Fig. 3, Fig. 2 an end view in the direction of the arrow B, Fig. 3, Fig.3 a front view, Fig. 4: a back view, Fig. a plan view, Fig. 6 asectional plan view on the line CC, Fig. 2, and Fig. 7 is a plan .of arocking arm hereinafter referred to.

A relieving attachment for a lathe illustrated in the accompanyingdrawings comprises a base plate 1 fastened to the first slide on thelathe saddle. On the plate '1. is slidahly mounted a bracket 2adjustably positioned by a fitting strip 3. On. a shaft 4, mountedin thelower front portion of the bracket 2 and extending through each. sidethereof, is pivotally mounted a rocking tool-holder 5. The cutting tool(3 i held in the tool holder 5 by means of a set screw 7. Suitableprovision is made for packing up the tool to keep the cutting edge in aneffective position. At each end of the shaft l is an adjustable cap 8,8, locked in position by set screws 9, 9. The caps 8, 8, fit closelyinto recesses 10, 10, of the base plate and support the outer ends ofthe shaft 4. The tool holder is given a rocking movement on the shaft 4by means of a link 11 one end of which is secured to Cir the tool holderby a bolt 12, and the other end is mounted on a sliding bolt 13 which isadjustably carried in a T shaped slot of an arm 14. This arm 14:integral with or fixed to a shaft 15 mounted in the upper part of thebracket 2 and projects therethrough.

Mounted in the bracket 2 is a hollow shaft 16 having a universal jointin the form of a ring 17 supported by trunnions 18 in the wall of theshaft '16. The ring17 supports a second ring 19 by trunnions 20. Thisring 19 carries a shaft 21. ii sleeve 22 is slidably keyed to the shaft21. The outer end of the sleeve 22 is suitably mounted for drive by thelathe spindle, and rotates at the same speed and in the same directionas the lathe spindle.

On the shaft 15 is keyed by its boss a lover or arm carrying at itsother end on a bolt 24. one end of a link 25, theother end of this linkbeing formed as a hook 526. The hook 26 is supported by a bolt 27 whichis adjustable in. a T shaped slot 28 in a rocking arm 125). The arm 29has'a boss 30 by which it is mounted on a stud or shaft 31, and aprojection 32 for limiting its movement in one direction by contact witha stud or catch 33.

Adjustably secured on the boss 30 of the arm 29 is a second arm 234iwhich carries a linger or peg The finger or peg 35 is arranged to beadjustable lengthwise. The arms 29 and 84 form a bell crank leverarrangement.

On the end of the hollow shaft 16 is fixed a multiple-tooth cam wheel ordisc 36, this cam. wheel rotating in the same direction as the lathespindle by virtue of the intervening drive mechanism. The cam wheel 36operates to impart a rocking movement to the tool holder as will behereinafter described.

The number of teeth in the cam wheel 36 correspond to those in thecutter being); relieved or the flutes being cut.

The position of the arm 3-1 cari.' ing the linger or peg 35 can bealtered by movement around the boss 30 of the arm 29.

Advancement towards the work axis is made by the tool for every tooth ofthe cam wheel that successively engages with the finger or peg 35. Aseach tooth passes the peg the tool, through the intervening mech anism,is returned to its outward position.

A. spring 38 attached at one end to the bracket 2 and at the other endto the rocking tool holder 5 assists in returning the latter to normalposition at the end of its rocking movement.

A spring 89 operating on the projection 32 of the arm 29 also functionsto assist in the apid retraction of the tool-holder, this retractiontaking place when the finger or peg 35 is pushed out of engagement.

The base plate 1 carries at one end in a lug a screw 41, the other endoi which screw fits into a screwed portion 4-2 of the bracket 2, thusproviding means for adjusting the bracket along the base plate 1.

The connection bet-ween the rocking arm 29 and the lever or arm 28 maybe broken down by removing the hook 26 from the bolt 27, this allowingfree movement of the shaft for the purpose of moving the tool out ofcontact with the work without altering the position of the tool in theholder.

Referring to the rocking arm 29 it will be seenv that it is orovidedwith a part circular slot 28 whereby the pivot of the connecting linkmay be set at val-yin distance. from the center of the stud. or shaft31. in this way the amount of relief imparted to the work by the motionof the rocking tool holder can be varied from zero up to the maximumprovided by the device. it will be obvious that when the link is set atthat end of the slot 28 remote from the stud or shaft 31 the maximumrelief: is obtained, the amount of relief gradually decreasing until thelink 25 is set in alignment with the stud or shaft 31 which correspondsto the ZGl'O setting.

As shewn .in Fig. 2 a scale 29 is provided on the arm 29, the ligitiresgiving the amount of relief in millimetres.

The setting of the link 25 in the slot of the working arm 29 is all thatis necessary when the device is to work with *ams bearing the samenumber of teeth, for example 16. But when a particular piece of worknecessitates a change of the cam to one bearing a-different number ofteeth, say for ex ample 8, it is necessary to compensate for the extentof movement whereby a correct amount of relief is obtained, as it isobvious that cams having different numbers of teeth will give varyingmovements to the bell. crank arrangement 29, Thus the setting of thelink.25 for a relief of two millimetres with a cam of 16 teeth will not becorrect when a cam of 8 teeth is used. To overcome this objection acompensating scale ti. is placed on the slotted arm it. This scale is soarranged that pointer 13 coincides therewith, each mark on the scalerepresenting: a cam with a given number of teeth. The pointer 13 movesin unison with the link bolt 3 in the slot 141-. The greater the numberof teeth in the cam 36 the further away the bolt 13 is placed from theaxis of the shaft 15, so that a. greater movement of the tool holderwill be effected and therefore compensation is provided for the smallermovement imparted by the increased number of teeth on the cam wheel 36.

From the above it will be understood that the scale 29 provides for thesettii r of the parts to give a determined range relief for a particularcam, andv the scale 42 acts as a guide for settingthe parts to allow ofa compensating movement .for cams having different numbers of teeth.Thus the scale 29 may be identified as the relief scale, and the scale42 as the compensating or teeth scale.

For imparting a to andfro movement to the tool holder 5 alon itssupporting shaft 4, the arm 23 has provi ed on a part of its boss gearteeth 44 engaging gear teeth 45 on a boss 47 of an arm 46 which arm isloosely mounted by its boss 47 on a stud or shaft 48 fixedin the bracket2. The boss 47. is housed. between ball thrust bearings 49. The lowerportion of the arm 46 carries a roller bearin 50. The rocking toolholder 5 is provider. at the upper part adjacent to the arm 46, with arecess 51 having an adjustable block 52 therein. The block is sofashioned as by a slot or groove 53 that the roller-bearing 50 of thearm 46 projects therein and co-acts therewith.

The block being adjustable in the recess 51. the slot or groove 53 canbe set at any angle relative to the axis of the shaft 4 on which thetool holder rocks, so that upon movement of the arm 46 the tool holder5, through the medium of the walls of the slot or groove 53, is moved toand fro along its supporting shaft.

Toassist in returning the tool holder 5 to its initial position aftereach sliding movement-along the supporting shaft, there may be providedoneach side of the bracket 2 a recessed boss 54l1ousing a spring 55hearing on a sliding cap or cover 56. Adjacent to the cap or cover andon the rocking tool holder is a screw fitting 57 carrying a ball 58bearing against the cap or cover 56. The screw fitting 57 is for thepurpose of :uljusting the pressure of the spring 55.

When imparting sliding movement to the tool holder along the supportingshaft it is llf'itSSillfy to slack back one of the caps 8 on theshai't 4in the direction it is desired to move the tool holder 5. The other capremains in its normal position and serves as a stop for the tool holderupon its return to initial position.

The mounting of the link 11 is such that the parts will accommodatethemselves to the to and :fro sliding movement oi? the tool holder.

The general operation of the attachment illustrated is as follows Motionis transmitted from the lathe spindle through the sleeve 22 and alliedparts to the multiple tooth cam wheel 36. The teeth of the cam wheel 36successively engage the finger or peg 35 and thus impart an os-'cillatory movement to the bell-crank mechanism Q9, 34 on the stud ll.Through the link 2:) and the arm 23; the shaft 15 and its slotted arm 14is also oscillated, and the counecting link 11 thus imparts a rockingmotion to the toolholder .5.

The tool holder may. at the same time be given a to and froslidingmovement along its supporting shaft 4 11s previously described. I

An arrangement whereby spiral relieving is obtained is follows:-

On the driving sleeve is provided a key which for ordinary relieving(parallel flutes) engages with a straight keywa 21 in the shaft 21. Forrelieving spiral flutes theikey is withdrawn from the straight keywayand inserted in a spirally cut keyway, 21. the angle 01 spiral beingthat required in the work. The tool reciprocations, therefore, gainor-lose in phase with the uniformly rotating work, and the requiredspiral etlect is produced. Several differ ent spirals of the same handmay be cut in one shaft.

In another arrangement the work at the same time as itis given angularvelocity m a have imparted thereto linear velocity.

The gearing for the multiple tooth cam wheel may be of equal ratio orvaried up and down a zcording to the nature oi the work.

It is possibleto dispense with the multiple tooth ram wheel andsubstitute therefor a wheel havinga single cam, speeding up of the drivethen being necessary. 7

When it is not desired to impart a to. and fro sliding movement to thetool holder, the means wherebythis is effected is rendered inoperative.Or the oscillation of the tool holder may be made in'operativeand the toand from motion only be used. This is effected hyplacing the slidingbolt 13 to zero position in the slot of the arm 14 whereby the link 11is not acted on by the shaft 15. Or both motions can be made inoperativeand the tool holder used as a slide rest.

Inside relieving i or hollow mills, threading dies, and the like can beeffected bvthe use of a cranked tool. i I The finger or peg may beadjustable in length.

lVith a rocking tool holder according to the present invention the outcan be continued close up to the radius face of the tooth, as a rapidretraction or withdrawal otf the cutting tool at the end of the cut iseffected.

lVith an apparatus under the present in vei'ition face relief and :oneside relief can be effected .in one operation. I ,F or ordinary turningthe oscillating movement is dispensed with.

v lVhat I claim is r v 1. In apparatus for use inrelieving, cut? ting,shaping, profiling and the like'processes the combination of a pivotallyn'iounted toolholder, a cam element for imparting an oscillatingmovement thereto, connecting merhanism between the tool-holder and theCir .cam element and a segmental groove and setting block for varyingthe magnitude of the angular oscillations of the tool-hdlder.

Apparatus as claimed in claim 1 hereof having means operated by theconnected mechanism for imparting a to and fro motion parallel orsubstantially parallel to the axis of the Work.

3. Apparatus for use in relieving, cutting, shaping, profiling and thelike processes, comprising a pivotally mounted toolholder, a camelement, means for driving said cam element, and lever and linkmechanism interposed between the toolholder and the cam elementandcoupled to the "todl holder sub stantially as described.

-l-. X\.P1)lll' btll[-i for use in relieving, cutting, shaping,profiling and the like processes, comprising a rocking tool-"holder, acam ele ment, means for driving said cam element, connecting mechanisminterposed between the tool-holder and the cam element, and meansdependent on the connecting mechanism for 'in'iparting a: to and fromotion parallel' to the axis ot the work, substantially as (h -scribed.I

Apparatus for use in relieving, cutting, shaping, profiling and the likeprocesses, comprising in combination a rocking tool holder, a camelement, mechanism interposed between the tool holder and the camelement whereby the movement of the cam element controls the oscillationof the tool holder during the cut, and setting means for varying theamout oi? relief iu'iparted to the work.

6. Apparatus as claimed in claim 8 hereof wherein the setting means forvarying the amount of relief com-prisesa slotted piv oted element and alink element cooperating therewith.

7. Apparatus for use in relieving, cutting, shaping, profiling and thelike processes, comprising in combination a rocking tool holder, a camelement, mechanism interposed. between the tool holder and the camelement whereby the movement of the cam element controls the oscillationof the tool holder during the cut, setting means for varying the amountof relief imparted to the work, and compensating means co-operating withthe setting meansfor the purpose described.

8. In apparatus for use in relieving, cut ting, shaping, profiling andthe like processes, the combination of a rocking tool holder, acuttingtoolcarriedthereby, a controlled feed for the tool holder during thecut, means for driving the said feed, and setting means for varying theamount of relief imparted to the work.

9. Apparatus for use in relieving, cutting, shaping. profiling and thelike processes comprising in combination a base plate, a rocking toolholder mounted thereon, a cutting tool mounted thereon, a cutting toolcarried by the tool holder, a cam component, means for impartingmovement to said cam component, lever and link mechanism interposedbetween the cam component and the rocking tool holder and operativeduring the cut to advance or recede the cutting edge of the tool towardsor from the axis of the work in an arcuate path, said mechanism beingoperated and controlled by said cam component and means 'tor returningthe rocking tool holder to normal position at the end of the workingstroke.

10. Apparatus for use in relieving. cutting, shaping, profiling and thelike processes comprising 1I1'COIli1bfl'l1tll3l0ll a base plate,

a rocking tool holder ZHOHntQd thereon, a

tive during the cut to ad anceor recede the cutting edge of the tooltowards or from the axis of the work in an arcuate path. said mechanismbeing operated and controlled by said cam component, means for returningthe rocking tool holder to normal position at the end of the workingstroke, and setting means for varying the amount of reliei. con sistingof a slotted pivoted element and a link element co-opera'ting therewith.

11. Apparatus :tor use in relieving. cu'tting, slia iin'g, profiling andthe like proc- OSSQS'COIHPIHSHIg in combination a. base plate, a rockingtool holder mounted thereon, a cutting tool carried by the tool holder,a cam component, means for imparting movement to said cam component,lever and link mechanism interposed between thecam component and therocking tool holder and 0p crative during the cut to advance or recedethe cutting edge of the tool towards or from the axis of the work in anarcuate path, said n'iechanism being operated and controlled by said camcomponent, means for returning the rocking tool holder to normalposition at the/end of the working stroke, and setting means for varyingthe amountof relief consisting of a pivoted element having a slottherein; 2111 indicating scale on said pivoted. element, a link elementone end of which moves in the slot of the pivoted element, andcompensating means co-operating with the setting means for the purposesdescribed.

12. Apparatus for use in relieving, cutting, shaping, profiling and thelike processes comprising incombination a base plate, a rocking toolholder mounted thereon, a

cutting tool carried by the tool holder, a

cam component, means for imparting movement to said cam component, leverand link mechanism interposed between the cam component and the rockingtool holder and operative during the cut to advance or recedc the toolholder at right angles to its rocking movement, said means beingoperatedby the lever and link mechanism.

In testimony whereof, I afiix my signature. I

EDWARD MILTON VVILDEY.

